LTC3541-1 Datasheet, PDF (3/20 Pages) Linear Technology – High Efficiency Buck + VLDO Regulator

LTC3541-1
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise specified (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP MAX
V_BUCKFB
Reference Regulation Voltage
(Note 6)
ENBUCK = V_IN, ENVLDO = 0V, T_A = 25°C
ENBUCK = V_IN, ENVLDO = 0V, 0°C ≤ T_A ≤ 85°C
0.784
0.782
0.8 0.816
0.8 0.818
ENBUCK = V_IN, ENVLDO = 0V, –40°C ≤ T_A ≤ 85°C
l 0.78
0.8
0.82
V_LFB
Reference Regulation Voltage
ENBUCK = 0V, ENVLDO = V_IN, T_A = 25°C
(Note 7)
ENBUCK = 0V, ENVLDO = V_IN, 0°C ≤ T_A ≤ 85°C
0.392
0.391
0.4 0.408
0.4 0.409
ENBUCK = 0V, ENVLDO = V_IN, –40°C ≤ T_A ≤ 85°C
l 0.390
0.4 0.410
I_S
Buck + VLDO
LV_IN = 1.5V, LV_OUT = 1.2V, ENBUCK = V_IN,
85
Burst Mode Sleep
ENVLDO = V_IN, MODE = 0V, I_OUT(VLDO) = 10µA,
V_IN Quiescent Current
V_BUCKFB = 0.9V
Buck + VLDO
LV_IN = 1.5V, LV_OUT = 1.2V, ENBUCK = V_IN,
315
Burst Mode Active
ENVLDO = V_IN, MODE = 0V, I_OUT(VLDO) = 10µA,
V_IN Quiescent Current
V_BUCKFB = 0.7V
Buck + VLDO
LV_IN = 1.5V, LV_OUT = 1.2V, ENBUCK = V_IN,
300
Pulse-Skip Mode Active
ENVLDO = V_IN, MODE = V_IN, I_OUT(VLDO) = 10µA,
V_IN Quiescent Current
V_BUCKFB = 0.7V
Buck
V_BUCKFB = 0.9V, I_OUT(BUCK) = 0A, ENBUCK = V_IN,
55
Burst Mode Sleep
ENVLDO = 0V, MODE = 0V
V_IN Quiescent Current
Buck
V_BUCKFB = 0.7V, I_OUT(BUCK) = 0A, ENBUCK = V_IN,
300
Burst Mode Active
ENVLDO = 0V, MODE = 0V
V_IN Quiscent Current
Buck
V_BUCKFB = 0.7V, I_OUT(BUCK) = 0A, ENBUCK = V_IN,
285
Pulse-Skip Mode Active
ENVLDO = 0V, MODE = V_IN
V_IN Quiescent Current
Linear Regulator V_IN Quiescent LV_OUT = 1.2V, ENBUCK = 0V, ENVLDO = V_IN,
50
Current
I_OUT(LREG) = 10µA
V_IN Shutdown Quiescent Current ENBUCK = 0V, ENVLDO = 0V
2.5
LV_IN Shutdown Quiescent Current LV_IN = 3.6V, ENBUCK = 0V, ENVLDO = 0V
0.1
f_OSC
Oscillator Frequency
l 1.8
2.25
2.7
R_PFET
R_DS(ON) of P-Channel MOSFET I_SW = 100mA
0.25
R_NFET
R_DS(ON) of N-Channel MOSFET I_SW = 100mA
0.35
I_LSW
SW Leakage
Enable = 0V, V_SW = 0V or 6V, V_IN = 6V
±0.01 ±1
V_IH
Input Pin High Threshold
MODE, ENBUCK, ENVLDO
l 0.9
V_IL
Input Pin Low Threshold
MODE, ENBUCK, ENVLDO
l
0.3
I_MODE,
I_ENBUCK,
I_ENVLDO
Input Pin Current
l
±0.01 ±1
UNITS
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
MHz
Ω
Ω
µA
V
V
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3541-1 is guaranteed to meet performance specifications
from 0°C to 85°C. VLDO/linear regulator output is tested and specified
under pulse load conditions such that T_J ≈ T_A, and are 100% production
tested at 25°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Minimum operating LV_IN voltage required for VLDO regulator
regulation is:
Note 4: Minimum operating V_IN voltage required for VLDO regulator and
linear regulator regulation is:
V_IN ≥ LV_OUT + 1.4V and V_IN ≥ 2.7V
Note 5: T_J is calculated from the ambient temperature, T_A, and power
dissipation, P_D, according to the following formula:
T_J = T_A + (P_D • 43°C/W)
Note 6: The LTC3541-1 is tested in a proprietary test mode that connects
V_BUCKFB to the output of the error amplifier. For the reference regulation
and line regulation tests, the output of the error amplifier is set to the
midpoint. For the load regulation test, the output of the error amplifier is
driven to minimum and maximum of the signal range.
LV_IN ≥ LV_OUT + V_DROPOUT and LV_IN ≥ 0.9V
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